LinkedList，队列与列表的区别 [英] Difference in LinkedList, queue vs list
问题描述
创建这两个对象有什么区别
What is the difference when creating these two objects
Queue<String> test = new LinkedList<String>();
和
List<String> test2 = new LinkedList<String>();
test 之间的实际差异是什么？ TEST2 ？它们都是 LinkedList ？是否存在使用其中一个的性能差异或原因？
What are the actual differences between test and test2? Are both of them LinkedList ? Are there performance differences or reasons to use one over the other?
推荐答案
您编写的两个语句构成一个 LinkedList< String> 用于保存字符串列表的对象，然后将其分配给变量。区别在于变量的类型。
The two statements you've written each construct a LinkedList<String> object to hold a list of strings, then assign it to a variable. The difference is in the type of the variable.
通过将 LinkedList< String> 分配给类型变量 Queue< String> ，您只能访问
By assigning the LinkedList<String> to a variable of type Queue<String>, you can only access the methods in the LinkedList that are available in the Queue<String> interface, which includes support for enqueuing and dequeuing elements. This would be useful if you needed to write a program that used a queue for various operations and wanted to implement that queue by using a linked list.
通过分配 LinkedList< String> 到类型 List< String> 的变量，你只能访问<$ c $中的方法c> LinkedList 在 List< String> 界面中可用，它们是维护一系列元素的常规操作。这将是有用的，例如，如果您需要处理可在任何地方增长和缩小的元素列表。
By assigning the LinkedList<String> to a variable of type List<String>, you can only access the methods in the LinkedList that are available in the List<String> interface, which are normal operations for maintaining a sequence of elements. This would be useful, for example, if you needed to process a list of elements that could grow and shrink anywhere.
简而言之，这两行创建相同的对象但打算以不同的方式使用它们。一个说它需要一个由链表支持的队列，而另一个说它需要一个由链表支持的一般元素序列。
In short, the two lines create the same object but intend to use them in different ways. One says that it needs a queue backed by a linked list, while the other says that it needs a general sequence of elements backed by a linked list.
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